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From:   Szymon Janc <szymon.janc@codecoup.pl>
To:     =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>
Cc:     linux-bluetooth@vger.kernel.org
Subject: Re: bluetoothctl: list-attributes doesn't list services from example-gatt-server
Date:   Wed, 17 Jul 2019 11:44:51 +0200
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Organization: CODECOUP
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Hi,

On Wednesday, 17 July 2019 11:38:21 CEST Rafa=C5=82 Mi=C5=82ecki wrote:
> On 09.07.2019 14:14, Rafa=C5=82 Mi=C5=82ecki wrote:
> > On 07.07.2019 12:14, Rafa=C5=82 Mi=C5=82ecki wrote:
> >> I decided to test GATT. On elitebook I started:
> >> ./test/example-gatt-server
> >> and waited to let matebook refresh all info.
> >>=20
> >> After that I got:
> >>=20
> >> [elitebook]# info 20:16:B9:D8:A9:3B
> >> Device 20:16:B9:D8:A9:3B (public)
> >>          Name: elitebook
> >>          Alias: elitebook
> >>          Class: 0x001c010c
> >>          Icon: computer
> >>          Paired: yes
> >>          Trusted: yes
> >>          Blocked: no
> >>          Connected: yes
> >>          LegacyPairing: no
> >>          UUID: IrMC Sync               =20
> >> (00001104-0000-1000-8000-00805f9b34fb) UUID: OBEX Object Push        =
=20
> >> (00001105-0000-1000-8000-00805f9b34fb) UUID: OBEX File Transfer      =
=20
> >> (00001106-0000-1000-8000-00805f9b34fb) UUID: Headset                 =
=20
> >> (00001108-0000-1000-8000-00805f9b34fb) UUID: Audio Source            =
=20
> >> (0000110a-0000-1000-8000-00805f9b34fb) UUID: Audio Sink              =
=20
> >> (0000110b-0000-1000-8000-00805f9b34fb) UUID: A/V Remote Control Target
> >> (0000110c-0000-1000-8000-00805f9b34fb) UUID: A/V Remote Control      =
=20
> >> (0000110e-0000-1000-8000-00805f9b34fb) UUID: Headset AG              =
=20
> >> (00001112-0000-1000-8000-00805f9b34fb) UUID: Phonebook Access Server =
=20
> >> (0000112f-0000-1000-8000-00805f9b34fb) UUID: Message Access Server   =
=20
> >> (00001132-0000-1000-8000-00805f9b34fb) UUID: Message Notification Se..
> >> (00001133-0000-1000-8000-00805f9b34fb) UUID: PnP Information         =
=20
> >> (00001200-0000-1000-8000-00805f9b34fb) UUID: Heart Rate              =
=20
> >> (0000180d-0000-1000-8000-00805f9b34fb) UUID: Battery Service         =
=20
> >> (0000180f-0000-1000-8000-00805f9b34fb) UUID: Vendor specific         =
=20
> >> (00005005-0000-1000-8000-0002ee000001) UUID: Vendor specific         =
=20
> >> (12345678-1234-5678-1234-56789abcdef0) Modalias: usb:v1D6Bp0246d0532
> >>=20
> >> That seems all correct for now. Test example-gatt-server registers
> >> Heart Rate, Battery & Test services. All of them appeared as expected.
> >>=20
> >> My problem is that I can't list GATT attributes. I don't any output.
> >> Is there anything I'm doing incorrectly?
> >=20
> > I decided to test nRF Connect Android app. It showed something
> > interesting about my bluetooth devices. It nicely displays & parses
> > advertising data.
> >=20
> > Logitech M590 advertises:
> > 0x01 Flags
> > 0x03 Complete List of 16-bit Service Class UUIDs
> > 0x09 Complete Local Name
> > 0x0A Tx Power Level
> > 0x19 Appearance
> >=20
> > BlueZ on "elitebook" advertises:
> > 0xFF Manufacturer Specific Data
> > or to say precisely:
> > 0x1BFF750042040180AE78BDBC0B7E307ABDBC0B7E2F01000000000000
> >=20
> > Any idea/hint why BlueZ 5.30 on my "elitebook" notebook doesn't
> > advertise more data?
>=20
> I've discovered I also need to run test/example-advertisement. Then I
> can see my notebook advertise UUIDs and characteristics. It seems that
> test/example-gatt-server is insufficient on its own.

Yeap, gatt-server is only for GATT. And advertisement has spearate API as=20
those are not necesserily used together.


=2D-=20
pozdrawiam
Szymon Janc